I have just remembered we had this problem: viewtopic.php?f=41&t=1068
IMHO, the variable should be called Color and not "color_" or be given some meaningful name exactly corresponding to the param marked with "*".
I don't know which ops other than Sprites have this problem, but there might be similar cases. I can investigate a little
Of course, this will break compatibility, but we've already stepped on that way...